Thats pretty much what that link does that I posted. Use the CD, boots into linux.. uses as ntfs driver... reads sams file.... make changes... writes back to the file... take out cd.. reboot... done. Whole process take less than 1 min... less than 4 if you are reading ever line/doing it for the first time.

1. Shutdown Computer And Restart In Safe Mode.
By Tapping f8 until u see the screen u want To boot
In SAfe Mode
2.Once U get to the Log on screen in safe mode. If
U have it sent to Manually type in a username and password type
Administrator. Or Just Click on the Account Named Administrator.
3.Now Go to Start--Control Panel---User Accounts.
4. Click on the account that u want to change the password to.
click change password. Then leave it blank and WALLA! U have
access to the account and it dosent have a password.